What action does the iliacus muscle perform?

What action does the iliacus muscle perform?

• A. Hip extension
• B. Hip flexion
• C. Knee extension
• D. Hip abduction

Answer: (B)

The iliacus is a primary hip flexor. Its fibers pull the femur upward and forward at the hip joint, which flexes the thigh toward the abdomen. It works together with psoas major as the iliopsoas, the main muscle group that drives hip flexion during movements like lifting the leg or starting to walk. It does not extend the knee, extend the hip, or abduct the thigh—those actions are handled by other muscles such as the quadriceps (knee extension), gluteus maximus (hip extension), and gluteal muscles (hip abduction). So the action performed by the iliacus is hip flexion.

The iliacus is a primary hip flexor. Its fibers pull the femur upward and forward at the hip joint, which flexes the thigh toward the abdomen. It works together with psoas major as the iliopsoas, the main muscle group that drives hip flexion during movements like lifting the leg or starting to walk. It does not extend the knee, extend the hip, or abduct the thigh—those actions are handled by other muscles such as the quadriceps (knee extension), gluteus maximus (hip extension), and gluteal muscles (hip abduction). So the action performed by the iliacus is hip flexion.